JP2002168111A - Inner silencer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To voluntarily adjust exhaust noise and engine power, in an inner silencer fitted inside a silencer of suppressing noise from an exhaust pipe of an engine for automobile or the like. SOLUTION: This silencer is installed inside the silencer part of an exhaust pipe. The inner silencer 1 is constituted of a main exhaust pipe 2, a cover member 3 which is a flat plate fixed to the outer periphery of the main exhaust pipe and closes an exhaust opening of the exhaust pipe and which has a flange part to be installed inside the main exhaust pipe, and an adjustable plate 4 of adjusting the area of the exhaust opening, installed on the cover member. The cover member and the adjustable plate are respectively formed with adjusting through-holes for adjusting the area of the exhaust opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer (silencer) for suppressing noise generated from an exhaust pipe from an engine of an automobile or the like. Related to the inner silencer that can be varied.

[0002]

2. Description of the Related Art Conventionally, for example, a silencer (muffler) 10 provided on an exhaust gas path for an automobile includes:
As shown in FIG. 6, an inner shell 11 and an outer shell 12 that covers the outside of the inner pipe 11 are provided. It is known that a space between the inner pipe 11 and the outer shell 12 is filled with a mat-like inorganic sheet layer 13 such as glass wool.

[0003]

However, in the conventional silencer 10 as described above, the exhaust sound is constant and cannot be adjusted, and the change is poor.
Therefore, various modifications are made to change the exhaust sound according to the individual preference of the owner of the automobile, but a simple and easy one is demanded. The inner silencer according to the present invention is proposed to solve such a problem.

[0004]

The gist of the present invention for solving the above-mentioned problems is that the inner sensor is provided in a silencer portion of an exhaust pipe, and has an exhaust main pipe and an outer peripheral portion of the exhaust main pipe. A lid member fixed to the exhaust pipe and closing the exhaust port of the exhaust pipe, the lid member having mounting means for mounting in the exhaust pipe, and a variable plate mounted on the lid member and varying the area of the exhaust port. The cover member and the variable plate are provided with adjusting through holes for varying the area of the exhaust port.

When the variable plate is rotated about the axis of the exhaust main pipe, the overlapping opening area of the adjusting through-hole changes steplessly, and the shape of the adjusting through-hole is overlapped. This includes a shape in which the opening area is changed in a non-linear manner.

According to the inner silencer of the present invention, by arbitrarily rotating the variable plate, the opening area of the exhaust port changes and the exhaust noise changes. Also, the overlapping opening area of the adjusting through-holes changes steplessly with a change in the rotation angle. As a result, it is possible to finely set an arbitrary exhaust sound according to preference. Furthermore, the change in the opening area is
Rather than increasing or decreasing linearly or linearly, it changes nonlinearly and almost in a curved manner. This allows a wide range of exhaust sounds,
Various changes can be obtained.

[0007]

Next, an inner silencer according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the inner silencer 1 includes an exhaust main pipe 2 which is a stainless steel cylinder, and an exhaust main pipe 2.
A lid member 3 having a flange portion 3b which is fixed to an outer peripheral portion of the exhaust pipe by welding or the like and which closes an exhaust port of an exhaust pipe from an engine, and which is a mounting means for mounting the exhaust pipe in the exhaust pipe; It mainly comprises a flat plate-shaped variable plate 4 mounted on the lid member 3 so as to be able to change the exhaust port area steplessly.

The cover member 3 and the variable plate 4 are provided with adjustment through holes 3c (FIG. 1) for varying the area of the exhaust port.
In FIG. 5), 4a are provided. The shape of the adjusting through holes 3c and 4a is a shape in which the overlapped opening area changes non-linearly. For example, the adjusting through holes 3c and 4a are formed in a raindrop shape curved in the circumferential direction.

As shown in FIG. 1, a through hole 3d for a set screw is provided in the flat plate member 3a of the lid member 3, as shown in FIG.
As shown in FIG. 2, a nut 3e for screwing a set screw is fixed to the back side of the through hole 3d by welding or the like. Are fixed to the inner peripheral wall surface of the flange portion 3b by welding or the like. At the position of the nut 3f, a through hole for a set screw is provided in the flange portion 3b.

As shown in FIG. 1, the variable plate 4 is provided with a through hole 4b in the center thereof through which the exhaust main pipe 2 is inserted. The through hole 4b is used for a set screw so that its position can be changed in the circumferential direction. A required number of long holes 4c which are screw holes and are long in the circumferential direction are provided. Also, a concave notch 4d at the peripheral edge
Is provided to avoid collision with the nut 3f of the lid member 3 during assembly.

As shown in FIGS. 1 and 2, the variable plate 4 is inserted into the exhaust main pipe 2 from one side by a hexagonal bolt 5 for a set screw and is brought into contact with the flat plate 3a.
Be attached. Thus, the inner silencer 1 is assembled as shown in FIG.

The assembled inner silencer 1
Is mounted on a silencer section 6 of an exhaust pipe 6a from an engine of an automobile or the like as shown in FIG. To this end, the rear part (the right side in FIG. 1) of the exhaust main pipe 2 of the inner silencer 1 is inserted first through the opening of the exhaust pipe 6a and the bolt 7 is inserted from the outer peripheral surface of the exhaust pipe 6a through the through hole. Then, it is inserted into the nut 3f of the flange portion 3b and screwed.

When the inner silencer 1 is used inside the exhaust pipe 6a, as shown in FIGS. 3 to 5, the adjusting through holes 3c and 4a are not overlapped at all (see FIG. 3). In the state shown in FIG. 5A), the portion other than the main exhaust pipe 2 is closed by the flat plate 3a, so that the exhaust gas from the engine is discharged only from the main exhaust pipe 2. Therefore, the opening area for exhaust is small, so that the exhaust noise is small and the engine output is also small.

Conversely, as shown in FIG. 5 (A), when the variable plate 4 is rotated in the direction of the arrow using the elongated hole 4c by slightly loosening the bolt 5, the adjusting through hole of the lid member 3 is formed. 3c and the adjusting through hole 4a of the variable plate 4 overlap and communicate as an exhaust port. Therefore, a new exhaust opening appears at the outer edge of the flat plate 3a, and the opening area combined with the exhaust main pipe 2 increases, and as shown in FIG. The adjusting through hole 3
Air is also exhausted from c and 4a.

As a result, the exhaust noise increases due to the increase in the opening area, and the engine output also increases. As shown in FIG. 4, the opening area is maximized when the adjusting through hole 3c of the cover member 3 and the adjusting through hole 4a of the variable plate 4 completely overlap each other, and around the axis of the exhaust main pipe 2. By rotating the variable plate 4, the opening area changes steplessly.

Also, the degree of the change in the opening area does not simply increase linearly in proportion to the rotation angle of the variable plate 4, but the adjusting through holes 3c and 4a are tapered in a curved manner. Since it is formed in the shape of a raindrop, it increases and decreases in a curved line.

[0017] Thus, not a monotonous change in exhaust sound,
The exhaust sound changes suddenly and can embody a wide range of changes. The shape of the adjusting through-hole is not limited to the raindrop type described above, and may be a triangular shape, an elliptical shape, or the like. Including those that do.

[0018]

As described above, the inner silencer according to the present invention is provided in the silencer portion of the exhaust pipe. A flat member for closing the exhaust port, the cover member having a mounting means for mounting in the exhaust pipe, and a variable plate mounted on the lid member to vary the area of the exhaust port; Since the variable plate is provided with adjusting through holes for varying the area of the exhaust port, an excellent effect that the exhaust sound and the output of the engine can be easily varied and arbitrarily varied. To play.

When the variable plate is rotated about the axis of the main exhaust pipe, the overlapping opening area of the adjusting through-hole changes steplessly, so that the exhaust sound and the like are finely adjusted not stepwise. be able to. In addition, since the shape of the through hole for adjustment is a shape that changes the overlapped opening area in a non-linear manner, the change in exhaust noise is diversified, and the taste of the automobile owner can be satisfied.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an inner silencer according to the present invention.

FIG. 2 is a side view of the inner silencer according to the present invention.

FIG. 3 is a cross-sectional view showing a state in which the inner silencer according to the present invention is provided in an exhaust pipe and an adjustment through-hole is not overlapped.

FIG. 4 is a cross-sectional view showing a state in which the inner silencer according to the present invention is housed in an exhaust pipe, and adjustment through holes are superimposed.

FIG. 5 is an explanatory view (A) of the inner silencer according to the present invention in a state where the through holes for adjustment do not overlap, and an explanatory view (B) of a case where the through holes for adjustment are overlapped.

FIG. 6 is a cross-sectional view of a silencer 10 according to a conventional example.

[Explanation of symbols]

Reference Signs List 1 inner silencer, 2 main exhaust pipe, 3 lid member, 3a plate, 3b flange, 3c adjustment through hole, 3d through hole, 3e nut, 3f nut, 4
Variable plate, 4a adjustment through hole, 4b through hole,
4c long hole, 4d notch, 5 volts, 6 silencer part, 6a exhaust pipe, 7 volts.

Claims (3)

[Claims] An exhaust main pipe, a flat body fixed to an outer peripheral portion of the exhaust main pipe and closing an exhaust port of the exhaust pipe, wherein the flat body is provided inside the exhaust pipe. And a variable plate attached to the lid member and configured to vary the area of the exhaust port. The lid member and the variable plate include an adjustment section for varying the area of the exhaust port. An inner silencer, wherein each of the through holes is provided. 2. The inner part according to claim 1, wherein the overlapping opening area of the adjusting through-hole changes steplessly by rotating the variable plate about the axis of the exhaust pipe main pipe. silencer. 3. The inner silencer according to claim 1, wherein the shape of the through hole for adjustment is a shape that changes the overlapping opening area in a non-linear manner.